VTKm_ENABLE_EXAMPLES broken | Cannot find source file: PolyLineArchimedeanHelix.cxx

After configuring vtk-m with VTKm_ENABLE_EXAMPLES=ON:

[0/1] Re-running CMake...
-- Configuring done
CMake Error at examples/polyline_archimedean_helix/CMakeLists.txt:14 (add_executable):
  Cannot find source file:

    PolyLineArchimedeanHelix.cxx

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx


CMake Error at examples/polyline_archimedean_helix/CMakeLists.txt:14 (add_executable):
  No SOURCES given to target: PolyLineArchimedeanHelix


-- Build files have been written to: /home/allie/code/build/vtk-m-Release
FAILED: build.ninja 
/usr/bin/cmake -S/home/allie/code/src/vtk-m -B/home/allie/code/build/vtk-m-Release
ninja: error: rebuilding 'build.ninja': subcommand failed